include/asm-x86/elf_32.h

   1 #ifndef __ASMi386_ELF_H
   2 #define __ASMi386_ELF_H
   3
   4 /*
   5  * ELF register definitions..
   6  */
   7
   8 #include <asm/ptrace.h>
   9 #include <asm/user.h>
  10 #include <asm/auxvec.h>
  11
  12 #define R_386_NONE      0
  13 #define R_386_32        1
  14 #define R_386_PC32      2
  15 #define R_386_GOT32     3
  16 #define R_386_PLT32     4
  17 #define R_386_COPY      5
  18 #define R_386_GLOB_DAT  6
  19 #define R_386_JMP_SLOT  7
  20 #define R_386_RELATIVE  8
  21 #define R_386_GOTOFF    9
  22 #define R_386_GOTPC     10
  23 #define R_386_NUM       11
  24
  25 typedef unsigned long elf_greg_t;
  26
  27 #define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
  28 typedef elf_greg_t elf_gregset_t[ELF_NGREG];
  29
  30 typedef struct user_i387_struct elf_fpregset_t;
  31 typedef struct user_fxsr_struct elf_fpxregset_t;
  32
  33 /*
  34  * This is used to ensure we don't load something for the wrong architecture.
  35  */
  36 #define elf_check_arch(x) \
  37         (((x)->e_machine == EM_386) || ((x)->e_machine == EM_486))
  38
  39 /*
  40  * These are used to set parameters in the core dumps.
  41  */
  42 #define ELF_CLASS       ELFCLASS32
  43 #define ELF_DATA        ELFDATA2LSB
  44 #define ELF_ARCH        EM_386
  45
  46 #ifdef __KERNEL__
  47
  48 #include <asm/processor.h>
  49 #include <asm/system.h>         /* for savesegment */
  50 #include <asm/desc.h>
  51
  52 /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program starts %edx
  53    contains a pointer to a function which might be registered using `atexit'.
  54    This provides a mean for the dynamic linker to call DT_FINI functions for
  55    shared libraries that have been loaded before the code runs.
  56
  57    A value of 0 tells we have no such handler.
  58
  59    We might as well make sure everything else is cleared too (except for %esp),
  60    just to make things more deterministic.
  61  */
  62 #define ELF_PLAT_INIT(_r, load_addr)    do { \
  63         _r->ebx = 0; _r->ecx = 0; _r->edx = 0; \
  64         _r->esi = 0; _r->edi = 0; _r->ebp = 0; \
  65         _r->eax = 0; \
  66 } while (0)
  67
  68 #define USE_ELF_CORE_DUMP
  69 #define ELF_EXEC_PAGESIZE       4096
  70
  71 /* This is the location that an ET_DYN program is loaded if exec'ed.  Typical
  72    use of this is to invoke "./ld.so someprog" to test out a new version of
  73    the loader.  We need to make sure that it is out of the way of the program
  74    that it will "exec", and that there is sufficient room for the brk.  */
  75
  76 #define ELF_ET_DYN_BASE         (TASK_SIZE / 3 * 2)
  77
  78 /* regs is struct pt_regs, pr_reg is elf_gregset_t (which is
  79    now struct_user_regs, they are different) */
  80
  81 #define ELF_CORE_COPY_REGS(pr_reg, regs)                \
  82         pr_reg[0] = regs->ebx;                          \
  83         pr_reg[1] = regs->ecx;                          \
  84         pr_reg[2] = regs->edx;                          \
  85         pr_reg[3] = regs->esi;                          \
  86         pr_reg[4] = regs->edi;                          \
  87         pr_reg[5] = regs->ebp;                          \
  88         pr_reg[6] = regs->eax;                          \
  89         pr_reg[7] = regs->xds & 0xffff;                 \
  90         pr_reg[8] = regs->xes & 0xffff;                 \
  91         pr_reg[9] = regs->xfs & 0xffff;                 \
  92         savesegment(gs,pr_reg[10]);                     \
  93         pr_reg[11] = regs->orig_eax;                    \
  94         pr_reg[12] = regs->eip;                         \
  95         pr_reg[13] = regs->xcs & 0xffff;                \
  96         pr_reg[14] = regs->eflags;                      \
  97         pr_reg[15] = regs->esp;                         \
  98         pr_reg[16] = regs->xss & 0xffff;
  99
 100 /* This yields a mask that user programs can use to figure out what
 101    instruction set this CPU supports.  This could be done in user space,
 102    but it's not easy, and we've already done it here.  */
 103
 104 #define ELF_HWCAP       (boot_cpu_data.x86_capability[0])
 105
 106 /* This yields a string that ld.so will use to load implementation
 107    specific libraries for optimization.  This is more specific in
 108    intent than poking at uname or /proc/cpuinfo.
 109
 110    For the moment, we have only optimizations for the Intel generations,
 111    but that could change... */
 112
 113 #define ELF_PLATFORM  (utsname()->machine)
 114
 115 #define SET_PERSONALITY(ex, ibcs2) do { } while (0)
 116
 117 /*
 118  * An executable for which elf_read_implies_exec() returns TRUE will
 119  * have the READ_IMPLIES_EXEC personality flag set automatically.
 120  */
 121 #define elf_read_implies_exec(ex, executable_stack)     (executable_stack != EXSTACK_DISABLE_X)
 122
 123 struct task_struct;
 124
 125 extern int dump_task_regs (struct task_struct *, elf_gregset_t *);
 126 extern int dump_task_fpu (struct task_struct *, elf_fpregset_t *);
 127 extern int dump_task_extended_fpu (struct task_struct *, struct user_fxsr_struct *);
 128
 129 #define ELF_CORE_COPY_TASK_REGS(tsk, elf_regs) dump_task_regs(tsk, elf_regs)
 130 #define ELF_CORE_COPY_FPREGS(tsk, elf_fpregs) dump_task_fpu(tsk, elf_fpregs)
 131 #define ELF_CORE_COPY_XFPREGS(tsk, elf_xfpregs) dump_task_extended_fpu(tsk, elf_xfpregs)
 132
 133 #define VDSO_HIGH_BASE          (__fix_to_virt(FIX_VDSO))
 134 #define VDSO_CURRENT_BASE       ((unsigned long)current->mm->context.vdso)
 135 #define VDSO_PRELINK            0
 136
 137 #define VDSO_SYM(x) \
 138                 (VDSO_CURRENT_BASE + (unsigned long)(x) - VDSO_PRELINK)
 139
 140 #define VDSO_HIGH_EHDR          ((const struct elfhdr *) VDSO_HIGH_BASE)
 141 #define VDSO_EHDR               ((const struct elfhdr *) VDSO_CURRENT_BASE)
 142
 143 extern void __kernel_vsyscall;
 144
 145 #define VDSO_ENTRY              VDSO_SYM(&__kernel_vsyscall)
 146
 147 struct linux_binprm;
 148
 149 #define ARCH_HAS_SETUP_ADDITIONAL_PAGES
 150 extern int arch_setup_additional_pages(struct linux_binprm *bprm,
 151                                        int executable_stack);
 152
 153 extern unsigned int vdso_enabled;
 154
 155 #define ARCH_DLINFO                                                     \
 156 do if (vdso_enabled) {                                                  \
 157                 NEW_AUX_ENT(AT_SYSINFO, VDSO_ENTRY);                    \
 158                 NEW_AUX_ENT(AT_SYSINFO_EHDR, VDSO_CURRENT_BASE);        \
 159 } while (0)
 160
 161 #endif
 162
 163 #endif